Wristwatch



FIG. 1 is a front elevational view of a wristwatch showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof.

The broken-line showing of strap ends one environmental only and form no part of the claimed design. 

The ornamental design for a wristwatch, as shown and described. 